Small island well away from the city. It used to be an important centre in the 5th-century AD but now just has a scattering of people. As an island it is big enough for a stroll. The main church, famous for its mosaic of Universal Justice, is a fair stroll from the landing pier. In light snow it is a fantastic experience. Go up the tower for stunning views across the lagoon and back to the other islands, Murano and Burano. Don't be surprised by the length of the vaporetto journey though - it's about an hour, far further out than the other islands and a completely different experience. By the way, there's a special place to sit - I won't tell you quite where it is, but if you find yourself there you will be married within a year according to local legend.
In the lagoon, take a vaporetto